/*
|
/*
|
* linux/fs/attr.c
|
* linux/fs/attr.c
|
*
|
*
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
* changes by Thomas Schoebel-Theuer
|
* changes by Thomas Schoebel-Theuer
|
*/
|
*/
|
|
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/mm.h>
|
#include <linux/mm.h>
|
#include <linux/string.h>
|
#include <linux/string.h>
|
#include <linux/smp_lock.h>
|
#include <linux/smp_lock.h>
|
#include <linux/dnotify.h>
|
#include <linux/dnotify.h>
|
#include <linux/fcntl.h>
|
#include <linux/fcntl.h>
|
#include <linux/quotaops.h>
|
#include <linux/quotaops.h>
|
|
|
/* Taken over from the old code... */
|
/* Taken over from the old code... */
|
|
|
/* POSIX UID/GID verification for setting inode attributes. */
|
/* POSIX UID/GID verification for setting inode attributes. */
|
int inode_change_ok(struct inode *inode, struct iattr *attr)
|
int inode_change_ok(struct inode *inode, struct iattr *attr)
|
{
|
{
|
int retval = -EPERM;
|
int retval = -EPERM;
|
unsigned int ia_valid = attr->ia_valid;
|
unsigned int ia_valid = attr->ia_valid;
|
|
|
/* If force is set do it anyway. */
|
/* If force is set do it anyway. */
|
if (ia_valid & ATTR_FORCE)
|
if (ia_valid & ATTR_FORCE)
|
goto fine;
|
goto fine;
|
|
|
/* Make sure a caller can chown. */
|
/* Make sure a caller can chown. */
|
if ((ia_valid & ATTR_UID) &&
|
if ((ia_valid & ATTR_UID) &&
|
(current->fsuid != inode->i_uid ||
|
(current->fsuid != inode->i_uid ||
|
attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
|
attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
|
goto error;
|
goto error;
|
|
|
/* Make sure caller can chgrp. */
|
/* Make sure caller can chgrp. */
|
if ((ia_valid & ATTR_GID) &&
|
if ((ia_valid & ATTR_GID) &&
|
(!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid) &&
|
(!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid) &&
|
!capable(CAP_CHOWN))
|
!capable(CAP_CHOWN))
|
goto error;
|
goto error;
|
|
|
/* Make sure a caller can chmod. */
|
/* Make sure a caller can chmod. */
|
if (ia_valid & ATTR_MODE) {
|
if (ia_valid & ATTR_MODE) {
|
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
|
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
|
goto error;
|
goto error;
|
/* Also check the setgid bit! */
|
/* Also check the setgid bit! */
|
if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
|
if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
|
inode->i_gid) && !capable(CAP_FSETID))
|
inode->i_gid) && !capable(CAP_FSETID))
|
attr->ia_mode &= ~S_ISGID;
|
attr->ia_mode &= ~S_ISGID;
|
}
|
}
|
|
|
/* Check for setting the inode time. */
|
/* Check for setting the inode time. */
|
if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
|
if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
|
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
|
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
|
goto error;
|
goto error;
|
}
|
}
|
fine:
|
fine:
|
retval = 0;
|
retval = 0;
|
error:
|
error:
|
return retval;
|
return retval;
|
}
|
}
|
|
|
int inode_setattr(struct inode * inode, struct iattr * attr)
|
int inode_setattr(struct inode * inode, struct iattr * attr)
|
{
|
{
|
unsigned int ia_valid = attr->ia_valid;
|
unsigned int ia_valid = attr->ia_valid;
|
int error = 0;
|
int error = 0;
|
|
|
if (ia_valid & ATTR_SIZE) {
|
if (ia_valid & ATTR_SIZE) {
|
error = vmtruncate(inode, attr->ia_size);
|
error = vmtruncate(inode, attr->ia_size);
|
if (error)
|
if (error)
|
goto out;
|
goto out;
|
}
|
}
|
|
|
if (ia_valid & ATTR_UID)
|
if (ia_valid & ATTR_UID)
|
inode->i_uid = attr->ia_uid;
|
inode->i_uid = attr->ia_uid;
|
if (ia_valid & ATTR_GID)
|
if (ia_valid & ATTR_GID)
|
inode->i_gid = attr->ia_gid;
|
inode->i_gid = attr->ia_gid;
|
if (ia_valid & ATTR_ATIME)
|
if (ia_valid & ATTR_ATIME)
|
inode->i_atime = attr->ia_atime;
|
inode->i_atime = attr->ia_atime;
|
if (ia_valid & ATTR_MTIME)
|
if (ia_valid & ATTR_MTIME)
|
inode->i_mtime = attr->ia_mtime;
|
inode->i_mtime = attr->ia_mtime;
|
if (ia_valid & ATTR_CTIME)
|
if (ia_valid & ATTR_CTIME)
|
inode->i_ctime = attr->ia_ctime;
|
inode->i_ctime = attr->ia_ctime;
|
if (ia_valid & ATTR_MODE) {
|
if (ia_valid & ATTR_MODE) {
|
inode->i_mode = attr->ia_mode;
|
inode->i_mode = attr->ia_mode;
|
if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
|
if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
|
inode->i_mode &= ~S_ISGID;
|
inode->i_mode &= ~S_ISGID;
|
}
|
}
|
mark_inode_dirty(inode);
|
mark_inode_dirty(inode);
|
out:
|
out:
|
return error;
|
return error;
|
}
|
}
|
|
|
static int setattr_mask(unsigned int ia_valid)
|
static int setattr_mask(unsigned int ia_valid)
|
{
|
{
|
unsigned long dn_mask = 0;
|
unsigned long dn_mask = 0;
|
|
|
if (ia_valid & ATTR_UID)
|
if (ia_valid & ATTR_UID)
|
dn_mask |= DN_ATTRIB;
|
dn_mask |= DN_ATTRIB;
|
if (ia_valid & ATTR_GID)
|
if (ia_valid & ATTR_GID)
|
dn_mask |= DN_ATTRIB;
|
dn_mask |= DN_ATTRIB;
|
if (ia_valid & ATTR_SIZE)
|
if (ia_valid & ATTR_SIZE)
|
dn_mask |= DN_MODIFY;
|
dn_mask |= DN_MODIFY;
|
/* both times implies a utime(s) call */
|
/* both times implies a utime(s) call */
|
if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
|
if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
|
dn_mask |= DN_ATTRIB;
|
dn_mask |= DN_ATTRIB;
|
else if (ia_valid & ATTR_ATIME)
|
else if (ia_valid & ATTR_ATIME)
|
dn_mask |= DN_ACCESS;
|
dn_mask |= DN_ACCESS;
|
else if (ia_valid & ATTR_MTIME)
|
else if (ia_valid & ATTR_MTIME)
|
dn_mask |= DN_MODIFY;
|
dn_mask |= DN_MODIFY;
|
if (ia_valid & ATTR_MODE)
|
if (ia_valid & ATTR_MODE)
|
dn_mask |= DN_ATTRIB;
|
dn_mask |= DN_ATTRIB;
|
return dn_mask;
|
return dn_mask;
|
}
|
}
|
|
|
int notify_change(struct dentry * dentry, struct iattr * attr)
|
int notify_change(struct dentry * dentry, struct iattr * attr)
|
{
|
{
|
struct inode *inode = dentry->d_inode;
|
struct inode *inode = dentry->d_inode;
|
int error;
|
int error;
|
time_t now = CURRENT_TIME;
|
time_t now = CURRENT_TIME;
|
unsigned int ia_valid = attr->ia_valid;
|
unsigned int ia_valid = attr->ia_valid;
|
|
|
if (!inode)
|
if (!inode)
|
BUG();
|
BUG();
|
|
|
attr->ia_ctime = now;
|
attr->ia_ctime = now;
|
if (!(ia_valid & ATTR_ATIME_SET))
|
if (!(ia_valid & ATTR_ATIME_SET))
|
attr->ia_atime = now;
|
attr->ia_atime = now;
|
if (!(ia_valid & ATTR_MTIME_SET))
|
if (!(ia_valid & ATTR_MTIME_SET))
|
attr->ia_mtime = now;
|
attr->ia_mtime = now;
|
|
|
lock_kernel();
|
lock_kernel();
|
if (inode->i_op && inode->i_op->setattr)
|
if (inode->i_op && inode->i_op->setattr)
|
error = inode->i_op->setattr(dentry, attr);
|
error = inode->i_op->setattr(dentry, attr);
|
else {
|
else {
|
error = inode_change_ok(inode, attr);
|
error = inode_change_ok(inode, attr);
|
if (!error) {
|
if (!error) {
|
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
|
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
|
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
|
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
|
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
|
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
|
if (!error)
|
if (!error)
|
error = inode_setattr(inode, attr);
|
error = inode_setattr(inode, attr);
|
}
|
}
|
}
|
}
|
unlock_kernel();
|
unlock_kernel();
|
if (!error) {
|
if (!error) {
|
unsigned long dn_mask = setattr_mask(ia_valid);
|
unsigned long dn_mask = setattr_mask(ia_valid);
|
if (dn_mask)
|
if (dn_mask)
|
dnotify_parent(dentry, dn_mask);
|
dnotify_parent(dentry, dn_mask);
|
}
|
}
|
return error;
|
return error;
|
}
|
}
|
|
|
